1 files changed, 22 insertions, 0 deletions
diff --git a/dom/webidl/PopupPositionedEvent.webidl b/dom/webidl/PopupPositionedEvent.webidl
new file mode 100644
index 0000000000..9aa35a8ddc
--- /dev/null
+++ b/dom/webidl/PopupPositionedEvent.webidl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+dictionary PopupPositionedEventInit : EventInit {
+  /**
+   * Returns the alignment position where the popup has appeared relative to its
+   * anchor node or point, accounting for any flipping that occurred.
+   */
+  DOMString alignmentPosition = "";
+  long alignmentOffset = 0;
+};
+
+[ChromeOnly, Exposed=Window]
+interface PopupPositionedEvent : Event {
+  constructor(DOMString type, optional PopupPositionedEventInit init = {});
+
+  readonly attribute DOMString alignmentPosition;
+  readonly attribute long alignmentOffset;
+};